If you want to be happy, do not dwell in the past, do not worry about the future, focus on living fully in the present.

Live in the present, remember the past, and fear not the future, for it doesn't exist and never shall. There is only now.

To dwell in the here and now does not mean you never think about the past or responsibly plan for the future. The idea is simply not to allow yourself to get lost in regrets about the past or worries about the future. If you are firmly grounded in the present moment, the past can be an object of inquiry, the object of your mindfulness and concentration. You can attain many insights by looking into the past. But you are still grounded in the present moment.

It is difficult to live in and enjoy the moment when you are thinking about the past or worrying about the future. You cannot change your past, but you can ruin the present by worrying about your future. Learn from the past, plan for the future. The more you live in and enjoy the present moment, the happier you will be.

Don't worry about the past and don't try to figure out the future

I don’t live in either my past or my future. I’m interested only in the present. If you can concentrate always on the present, you’ll be a happy man. Life will be a party for you, a grand festival, because life is the moment we’re living now.

Do not lose yourself in the past. Do not lose yourself in the future. Do not get caught in your anger, worries, or fears. Come back to the present moment, and touch life deeply. This is mindfulness.

dwell deeply in the present moment.

The present moment is where we need to operate. When you are truly anchored in the present moment, you can plan for the future in a much better way. Living mindfully in the present does not preclude making plans. It only means that you know there’s no use losing yourself in worries and fear concerning the future. If you are grounded in the present moment, you can bring the future into the present to have a deep look without losing yourself in anxiety and uncertainty. If you are truly present and know how to take care of the present moment as best you can, you are doing your best for the future already.

If I did not simply live from one moment to another, it would be impossible for me to be patient, but I only look at the present, I forget the past, and I take good care not to forestall the future.

forget the past, for it is gone from your domain! forget the future, for it is beyond your reach! control the present! Live supremely well now! This is the way of the wise...

Live for today — don’t think about the past or the future” has been misapplied to “Dwell on today.” We must all respond to imminent situations. We either benefit from, cope with, or succumb to them.

Don’t think about the future. Just be here now.

"Live the actual moment. Only this actual moment is life. Don’t be attached to the future. Don’t worry about things you have to do. Don’t think about getting up or taking off to do anything. Don’t think about “departing".